Device for intermittently stopping the motion of a strip of material



Sept. 1, 1953 J. L. CHAMBON 2,650,823

DEVICE FOR INTERMITTENTLY STOPPING THE MOTIQN OF A STRIP OF MATERIALFiled Sept. 26, 1950 5 Sheets-Sheet l In Ve/W r Jean Low/5 0161mm v Af/pr 4 Sept. 1, 1953 J. L. CHAMBON DEVICE FOR INTERMITTENTLY STOPPINGTHE MOTION OF A STRIP OF MATERIAL 5 Sheets-Sheet 2' Filed Sept. 26, 1950[n venfar Jean Lou/5 d/va w/wn Sept. 1, 1953 J. CHAMBON DEVICE FORINTERMITTENTLY STOPPING THE MOTION OF A STRIP OF MATERIAL.

5 Sheets-Sheet 5 Filed Sept. 26, 1950 In V6 277 0) J64? Lab/15(ha/775014 Patented Sept. 1, 1953 DEVICE FOR INTERMITTENTLY STOPPING THEMOTION OF A STRIP OF MATERIAL Jean Louis Chambon, Paris, France,assignor to Socit a Responsabilit Limite dite: Socit dEtudes dc MachinesSpeciales, Paris, France Application September 26, 1950, Serial No.186,706 In France October 1, 1949 3 Claims. 1

Apparatus are already known which are adapted to cut up strip material,for instance paper, fed continuously from a spool or reel, wherein thestrip is stopped during a given interval of time for allowing thecutting operation to proceed.

As a rule, the strip is stopped by means of a clamping device arrangedin the cutting portion of the apparatus. It is controlled by a cam andwhen this control occurs a loop is formed between the paper feedingdevice and the point where the strip is stopped. Of course, this loop istaken up during the period in which the clamp-- ing device is released.

However this arrangement offers important drawbacks. For instance, themass of the clamping device makes it impossible to use high speeds asthis would make inaccurate the moment in which the clamps engage thepaper whereby variable cut lengths would result. Moreover, the extremelysudden loop take-up would bring about irregularities when re-tensioningthe strip as the latter would vibrate around its position of equilibriumlike a tight-rope submitted to an impulse in its middle portion.

The object of the present invention is to provide a device adapted tostop intermittently a band or strip fed continuously by rollers, thearrangement permitting in particular, in combination with a knowncutting device, to cut up the band or strip while avoiding the drawbacks above referred to.

For this purpose the strip material from the feeding rollers is passedover a guiding roller having its shaft operatively connected to theshafts of these feeding rollers so that the guiding roller will besubmitted to an intermittent swinging movement likely to periodicallystop the strip movement at the outlet side of the guiding roller.

In the affixed drawing forming part of this specification there is shownby way of example a practical embodiment of the invention.

Fig. 1 of the drawing is a diagrammatic side elevational view of anapparatus for cutting up band or strip material fed continuously from areel or other source (not shown).

Fig. 2 is a more detailed axial vertical section of the apparatus.

Fig. 3 shows a sectional view through line III-III of Fig. 2.

In the drawing, an eccentric 5 is fixed on a shaft 3 rotatably driven byconventional means 20, 20a, 20b, 200 so that a given ratio will beobtained between this shaft and a pair of rollers I, 2 driven at aconstant speed.

The eccentric 5 is journaled in a central bore of a rocking frame 6having one end guided by slots 8 acting as slideways and engagingguidemembers I pivotally mounted on pins 2| fixed in an adjustablemanner on the fixed framework 22 of the machine. The opposite end of therocking frame 6 is formed with other slots I0 having fixed therein theshaft of a guidingroller 9 in a position corresponding to the length ofeach piece of strip material to be cut. The shaft of the guiding-roller9 is fixed in slots II! by the means of thumb-nuts 23. The pin 2| isfixed by the means of thumb-nuts 24 inside slots 25 provided in theframework 22.

The strip of paper or other material is introduced in the various partsof the machine, as illustrated in Figs. 1 and 2, and pulled at aconstant speed through the pair of rollers ll, I2 in slipping contacttherewith.

The peripheral speed of rollers I, I2 is definitely greater than that ofrollers I, 2 as is usual in apparatus adapted to accelerate or retardthe band fed at a constant speed on the inlet side of the machine.

Owing to the swinging movement imparted to roller 9 by the rotation ofthe eccentric 5 a certain intermittently variable speed will be added toor subtracted from the constant feeding speed of the paper strip. Bysuitably adjusting the position of the axis of the roller 9 on therocking frame 6 and, if necessary, the position of the axis of guidemembers I on the framework, a sufficient pause will be obtained at eachswinging movement of the rocking frame 6 to allow the cutter I3 andcounter-cutter M to cut the strip up during the resulting interval. Bymodifying the adjustment of roller 9 and guide members 1 it is alsopossible to obtain a slight backward movement of the strip materialafter the cutting step has been effected. This is advantageous in thatboth cutters will overlap each other by a greater extent so that thecutting force required will be less.

With the device according to this invention a certain number of cuttinglengths can be obtained without changing the eccentric.

Various modifications may be brought to the above description withoutdeparting from the spirit and scope of the invention. Thus, whenrelatively narrow bands are to be cut up the rocking frame 6 can bereplaced by a mere rocking lever on which a short roller 9 is mountedthrough a single one end-trunnion.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a device for producing intermittent stops in the motion of a stripof material fed continuously from feeding-rollers driven at a constantspeed, by the means of an idle guidingroller periodically actuated in aswinging movement in order to cause corresponding periodic variations inthe linear speed of the portion of strip which fiows from the outletside of said guiding roller and to produce consequently intermittentstops of said portion of strip, a shaft driven synchronously with thefeeding-rollers,

an eccentric carried by said"shaft, a rocking member having its middleportion pivoted on said eccentric, an idle guiding roller mounted on oneend portion of said rocking member, a 1ongitudinal slideway on theopposite end-portion of the same, and a guide member pivotally mountedaround a fixed axis and engaging saidlslidewayf carried by said shaft, arocking member having itsmiddle portion pivoted on said eccentric, anidle guiding roller mounted on one end portion of said rocking member,means for adjusting the position of said guiding rolier on the same,

a longitudinal slideway on the opposite end portion of said rockingmember, and a guide member pivotally mounted around a fixed axis andengaging said slideway of the rocking-member.

3. In a device for producing intermittent stops in the motion of a strip0! material fed continuously from feeding-rollers driven at a constantspeed, by the means of an idle guiding-roller periodically actuated in aswinging movement in order to cause corresponding periodic variationsinthe linear speed of the portion of strip which flows from the outletside of said guiding roller and to produce consequently intermittentstops of said portion of strip, a shaft driven synchronously with thefeeding-rollers, an eccentric carried by said shaft, a rocking-memberhaving its middle portion pivoted on said eccentric, an idleguiding-roller mounted on one end portion of said rocking-member, alongitudinal slideway on the opposite end-portion of the same, a guidemember engaging'said slideway ofthe rocking-member, a'fixed pivot forsaid guidemember, and means for adjusting the position of said fixedpivot.

JEAN LOUIS CHAMBON.

References Cited in the flle'of this patent' UNITED STATES PATENTSNumber Name Date 1,850,411 Mitchell Mar. 22, 1932 1,954,349 Dewey Apr.10, 1934 2,152,624 Cazes Apr. 4, 1939 2,275,064 Moore Mar. 3, 1942

